Sorry everyone. One of those ships of theirs would probably be able to take over the planet on its own. Supposedly these ships have been observed disabling nuclear missile silos. If they were communists, they would probably want to liberate us. They would likewise be able to do so right this moment. But they don't. Therefore, they aren't communists. Facts and logic :expert-shapiro:
How could a non-communist society send ships to other solar systems? It's possible. Something like Breakthrough Starshot could conceivably happen before a communist revolution on Earth. The USA, a fascist dictatorship, sent people to the moon.
If the UFOs are real, I think that they're some kind of automated probe(s) which were actually sent here hundreds if not thousands of years ago. (The earliest recorded UFO sighting was in 1440 BC.) As mentioned on the most recent episode of Guerilla History, UFOs might have been triggered or made more active somehow by the first detonation of an atomic bomb.
The civilization which built them might not even exist anymore, but their technology is evidently still way ahead of ours, which means it could be quite some time before we ever figure out what these UFOs actually are.
Something is definitely going on, though, whatever the fuck it is. The podcast mentions a guy I had never heard of named Ron Westrum. He gave a talk here mentioning how alien abductions probably aren't all in people's heads, since they sometimes happen to multiple people at the same time or are observed by others who are not abducted.
All of this generally shows that in spite of what people tell you, nobody really knows what the fuck is going on.
depends on oxygen concentration, we had like two meter long bugs before when there was more oxygen, if there was an 80/100 oxygen atmosphere insects could be very big
if there was that much oxygen their lungs would also catch fire occasionally. You are right I was being a bit overly restrictive, but generally speaking material forces shaped our evolution in to a few specific shapes and we would expect to see similar shapes repeated. Especially crabs. I take it back, aliens being giant crabs makes too much sense.
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There are still fundamenta limits. So yes, while there can be bigger animals with more o2. There is still an upper bound because of the loading strength of thr carbon atoms. And the molecules that are efficent to make out of them.
If we strip down the exoskelton and add lungs they could exist, then they wouldn't really be bugs anymore. We would expect to see convergent evilution.
For example, with how often crabs evolve on eart, if we don't find space crabs as one of thr first complex creatures I would honestly be terrified at the implications.
There might be one or two cases of some exotic structure developing. However largely would would expect to see things like what we got. If it was vaible to grow cells that peoduced carbon fiber cytoskeletons to make things super durable we would have seen something with it. They are either to hard to make, or don't stand up the chemical soup inside a body.
The range of available chemistry is inversely preportional to the selection pressure of an environmental. Look at extemeophile bacteria. Sure there are halophiles. But most molecules don't stand up that salty an environment so there is a hard limit to their complexity. They are mostly archaea and you wouldn't expect to see a sizable populaton of eukaryotes you know?